Patchwork [v2] I2C: add CSR SiRFprimaII on-chip I2C controllers driver

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Submitter Barry Song
Date Nov. 8, 2011, 6:12 a.m.
Message ID <1320732737-27996-1-git-send-email-Barry.Song@csr.com>
Download mbox | patch
Permalink /patch/124272/
State New
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Barry Song - Nov. 8, 2011, 6:12 a.m.
From: Zhiwu Song <Zhiwu.Song@csr.com>

SiRFprimaII is the latest generation application processor from CSR’s
multi-function SoC product family.
The SoC support codes are in arch/arm/mach-prima2 from Linux mainline
3.0.
There are two I2C controllers on primaII, features include:
■ Two I2C controller modules are on chip
■ RISC I/O bus read write register
■ Up to 16 bytes data buffer for issuing commands and writing data
  at the same time
■ Up to 16 commands, and receiving read data 16 bytes at a time
■ Error INT report (ACK check)
■ No-ACK bus protocols (SCCB bus protocols)

Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com>
Signed-off-by: Xiangzhen Ye <Xiangzhen.Ye@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
---
 -v2:
 I2C: SIRF: disable clk when i2c is idle(comment from Russell King);
 replace request irq, ioremap, malloc by devm_ versions(comment from
 Russell King);
 use new clk_prepare and clk_unprepare APIs(comment from Jamie Iles);
 other minor cleanup from Jamie Iles;

 drivers/i2c/busses/Kconfig    |    7 +
 drivers/i2c/busses/Makefile   |    1 +
 drivers/i2c/busses/i2c-sirf.c |  432 +++++++++++++++++++++++++++++++++++++++++
 drivers/i2c/busses/i2c-sirf.h |   61 ++++++
 4 files changed, 501 insertions(+), 0 deletions(-)
 create mode 100644 drivers/i2c/busses/i2c-sirf.c
 create mode 100644 drivers/i2c/busses/i2c-sirf.h
Barry Song - Nov. 14, 2011, 10:55 a.m.
ping

2011/11/8 Barry Song <Barry.Song@csr.com>:
> From: Zhiwu Song <Zhiwu.Song@csr.com>
>
> SiRFprimaII is the latest generation application processor from CSR’s
> multi-function SoC product family.
> The SoC support codes are in arch/arm/mach-prima2 from Linux mainline
> 3.0.
> There are two I2C controllers on primaII, features include:
> ■ Two I2C controller modules are on chip
> ■ RISC I/O bus read write register
> ■ Up to 16 bytes data buffer for issuing commands and writing data
>  at the same time
> ■ Up to 16 commands, and receiving read data 16 bytes at a time
> ■ Error INT report (ACK check)
> ■ No-ACK bus protocols (SCCB bus protocols)
>
> Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com>
> Signed-off-by: Xiangzhen Ye <Xiangzhen.Ye@csr.com>
> Signed-off-by: Barry Song <Baohua.Song@csr.com>
> ---
>  -v2:
>  I2C: SIRF: disable clk when i2c is idle(comment from Russell King);
>  replace request irq, ioremap, malloc by devm_ versions(comment from
>  Russell King);
>  use new clk_prepare and clk_unprepare APIs(comment from Jamie Iles);
>  other minor cleanup from Jamie Iles;
>
>  drivers/i2c/busses/Kconfig    |    7 +
>  drivers/i2c/busses/Makefile   |    1 +
>  drivers/i2c/busses/i2c-sirf.c |  432 +++++++++++++++++++++++++++++++++++++++++
>  drivers/i2c/busses/i2c-sirf.h |   61 ++++++
>  4 files changed, 501 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/i2c/busses/i2c-sirf.c
>  create mode 100644 drivers/i2c/busses/i2c-sirf.h
>
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index b2b8562..f97772c 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -619,6 +619,13 @@ config I2C_SH_MOBILE
>          This driver can also be built as a module.  If so, the module
>          will be called i2c-sh_mobile.
>
> +config I2C_SIRF
> +       tristate "CSR SiRFprimaII I2C interface"
> +       depends on ARCH_PRIMA2
> +       help
> +         If you say yes to this option, support will be included for the
> +         CSR SiRFprimaII I2C interface.
> +
>  config I2C_SIMTEC
>        tristate "Simtec Generic I2C interface"
>        select I2C_ALGOBIT
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index fba6da6..c30db66 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -62,6 +62,7 @@ obj-$(CONFIG_I2C_S3C2410)     += i2c-s3c2410.o
>  obj-$(CONFIG_I2C_S6000)                += i2c-s6000.o
>  obj-$(CONFIG_I2C_SH7760)       += i2c-sh7760.o
>  obj-$(CONFIG_I2C_SH_MOBILE)    += i2c-sh_mobile.o
> +obj-$(CONFIG_I2C_SIRF)         += i2c-sirf.o
>  obj-$(CONFIG_I2C_SIMTEC)       += i2c-simtec.o
>  obj-$(CONFIG_I2C_STU300)       += i2c-stu300.o
>  obj-$(CONFIG_I2C_TEGRA)                += i2c-tegra.o
> diff --git a/drivers/i2c/busses/i2c-sirf.c b/drivers/i2c/busses/i2c-sirf.c
> new file mode 100644
> index 0000000..1d694f6
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-sirf.c
> @@ -0,0 +1,432 @@
> +/*
> + * I2C bus driver for CSR SiRFprimaII
> + *
> + * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
> + *
> + * Licensed under GPLv2 or later.
> + */
> +
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/init.h>
> +#include <linux/sched.h>
> +#include <linux/platform_device.h>
> +#include <linux/i2c.h>
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +
> +#include "i2c-sirf.h"
> +
> +#define SIRFSOC_I2C_DEFAULT_SPEED  100000
> +
> +struct sirfsoc_i2c {
> +       void __iomem *base;
> +       struct clk *clk;
> +       unsigned long speed;    /* I2C SCL frequency */
> +       int irq;
> +       u32 cmd_ptr;            /* Current position in CMD buffer */
> +       u8 *buf;                /* Buffer passed by user */
> +       u32 msg_len;            /* Message length */
> +       u32 finished_len;       /* number of bytes read/written */
> +       u32 read_cmd_len;       /* number of read cmd sent */
> +       int msg_read;           /* 1 indicates a read message */
> +       int err_status;         /* 1 indicates an error on bus */
> +
> +       u32 sda_delay;          /* For suspend/resume */
> +       u32 clk_div;
> +       int last;               /* Last message in transfer, STOP cmd can be sent */
> +
> +       struct completion done; /* indicates completion of message transfer */
> +       struct i2c_adapter *adapter;
> +};
> +
> +static void i2c_sirfsoc_read_data(struct sirfsoc_i2c *siic)
> +{
> +       u32 data = 0;
> +       int i = 0;
> +
> +       for (i = 0; i < siic->read_cmd_len; i++) {
> +               if (!(i & 0x3))
> +                       data = readl(siic->base + SIRFSOC_I2C_DATA_BUF + i);
> +               siic->buf[siic->finished_len++] =
> +                       (unsigned char)((data & SIRFSOC_I2C_DATA_MASK(i)) >>
> +                               SIRFSOC_I2C_DATA_SHIFT(i));
> +
> +               BUG_ON(siic->finished_len > siic->msg_len);
> +       }
> +}
> +
> +static void i2c_sirfsoc_queue_cmd(struct sirfsoc_i2c *siic)
> +{
> +       u32 regval;
> +       int i = 0;
> +
> +       if (siic->msg_read) {
> +               while (((siic->finished_len + i) < siic->msg_len)
> +                       && (siic->cmd_ptr < SIRFSOC_I2C_CMD_BUF_MAX)) {
> +                       regval = SIRFSOC_I2C_READ | SIRFSOC_I2C_CMD_RP(0);
> +                       if (((siic->finished_len + i) ==
> +                                       (siic->msg_len - 1)) && siic->last)
> +                               regval |= SIRFSOC_I2C_STOP | SIRFSOC_I2C_NACK;
> +                       writel(regval,
> +                               siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
> +                       i++;
> +               }
> +
> +               siic->read_cmd_len = i;
> +       } else {
> +               while ((siic->cmd_ptr < SIRFSOC_I2C_CMD_BUF_MAX - 1)
> +                       && (siic->finished_len < siic->msg_len)) {
> +                       regval = SIRFSOC_I2C_WRITE | SIRFSOC_I2C_CMD_RP(0);
> +                       if ((siic->finished_len == (siic->msg_len - 1))
> +                               && siic->last)
> +                               regval |= SIRFSOC_I2C_STOP;
> +                       writel(regval,
> +                               siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
> +                       writel(siic->buf[siic->finished_len++],
> +                               siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
> +               }
> +       }
> +       siic->cmd_ptr = 0;
> +
> +       /* Trigger the transfer */
> +       writel(SIRFSOC_I2C_START_CMD, siic->base + SIRFSOC_I2C_CMD_START);
> +}
> +
> +static irqreturn_t i2c_sirfsoc_irq(int irq, void *dev_id)
> +{
> +       struct sirfsoc_i2c *siic = (struct sirfsoc_i2c *)dev_id;
> +       u32 i2c_stat = readl(siic->base + SIRFSOC_I2C_STATUS);
> +
> +       if (i2c_stat & SIRFSOC_I2C_STAT_ERR) {
> +               /* Error conditions */
> +               siic->err_status = 1;
> +               writel(SIRFSOC_I2C_STAT_ERR, siic->base + SIRFSOC_I2C_STATUS);
> +
> +               if (i2c_stat & SIRFSOC_I2C_STAT_NACK)
> +                       dev_err(&siic->adapter->dev, "ACK not received\n");
> +               else
> +                       dev_err(&siic->adapter->dev, "I2C error\n");
> +
> +               complete(&siic->done);
> +       } else if (i2c_stat & SIRFSOC_I2C_STAT_CMD_DONE) {
> +               /* CMD buffer execution complete */
> +               if (siic->msg_read)
> +                       i2c_sirfsoc_read_data(siic);
> +               if (siic->finished_len == siic->msg_len)
> +                       complete(&siic->done);
> +               else /* Fill a new CMD buffer for left data */
> +                       i2c_sirfsoc_queue_cmd(siic);
> +
> +               writel(SIRFSOC_I2C_STAT_CMD_DONE, siic->base + SIRFSOC_I2C_STATUS);
> +       }
> +
> +       return IRQ_HANDLED;
> +}
> +
> +static void i2c_sirfsoc_set_address(struct sirfsoc_i2c *siic,
> +       struct i2c_msg *msg)
> +{
> +       unsigned char addr;
> +       u32 regval = SIRFSOC_I2C_START | SIRFSOC_I2C_CMD_RP(0) | SIRFSOC_I2C_WRITE;
> +
> +       /* no data and last message -> add STOP */
> +       if (siic->last && (msg->len == 0))
> +               regval |= SIRFSOC_I2C_STOP;
> +
> +       writel(regval, siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
> +
> +       addr = msg->addr << 1;  /* Generate address */
> +       if (msg->flags & I2C_M_RD)
> +               addr |= 1;
> +       if (msg->flags & I2C_M_REV_DIR_ADDR)    /* Reverse direction bit */
> +               addr ^= 1;
> +
> +       writel(addr, siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
> +}
> +
> +static int i2c_sirfsoc_xfer_msg(struct sirfsoc_i2c *siic, struct i2c_msg *msg)
> +{
> +       u32 regval = readl(siic->base + SIRFSOC_I2C_CTRL);
> +       int timeout = (msg->len + 1) * 50;
> +       int ret = 0;
> +
> +       i2c_sirfsoc_set_address(siic, msg);
> +
> +       writel(regval | SIRFSOC_I2C_CMD_DONE_EN | SIRFSOC_I2C_ERR_INT_EN,
> +               siic->base + SIRFSOC_I2C_CTRL);
> +       i2c_sirfsoc_queue_cmd(siic);
> +
> +       if (wait_for_completion_timeout(&siic->done, timeout) == 0) {
> +               siic->err_status = 1;
> +               dev_err(&siic->adapter->dev, "Transfer timeout\n");
> +       }
> +
> +       writel(regval & ~(SIRFSOC_I2C_CMD_DONE_EN | SIRFSOC_I2C_ERR_INT_EN),
> +               siic->base + SIRFSOC_I2C_CTRL);
> +       writel(0, siic->base + SIRFSOC_I2C_CMD_START);
> +
> +       if (siic->err_status) {
> +               writel(readl(siic->base + SIRFSOC_I2C_CTRL) | SIRFSOC_I2C_RESET,
> +                       siic->base + SIRFSOC_I2C_CTRL);
> +               while (readl(siic->base + SIRFSOC_I2C_CTRL) & SIRFSOC_I2C_RESET)
> +                       cpu_relax();
> +
> +               ret = -EIO;
> +       }
> +
> +       return ret;
> +}
> +
> +static u32 i2c_sirfsoc_func(struct i2c_adapter *adap)
> +{
> +       return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static int i2c_sirfsoc_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
> +       int num)
> +{
> +       struct sirfsoc_i2c *siic = adap->algo_data;
> +       int i, ret;
> +
> +       for (i = 0; i < num; i++) {
> +               siic->buf = msgs[i].buf;
> +               siic->msg_len = msgs[i].len;
> +
> +               if (msgs[i].flags & I2C_M_RD)
> +                       siic->msg_read = 1;
> +               else
> +                       siic->msg_read = 0;
> +
> +               siic->err_status = 0;
> +               siic->cmd_ptr = 0;
> +               siic->finished_len = 0;
> +               if (i == (num - 1))
> +                       siic->last = 1;
> +               else
> +                       siic->last = 0;
> +
> +               ret = i2c_sirfsoc_xfer_msg(siic, &msgs[i]);
> +               if (ret) {
> +                       clk_disable(siic->clk);
> +                       return ret;
> +               }
> +       }
> +
> +       clk_disable(siic->clk);
> +       return num;
> +}
> +
> +/* I2C algorithms associated with this master controller driver */
> +static const struct i2c_algorithm i2c_sirfsoc_algo = {
> +       .master_xfer = i2c_sirfsoc_xfer,
> +       .functionality = i2c_sirfsoc_func,
> +};
> +
> +static int __devinit i2c_sirfsoc_probe(struct platform_device *pdev)
> +{
> +       struct sirfsoc_i2c *siic;
> +       struct i2c_adapter *new_adapter;
> +       struct resource *mem_res;
> +       struct clk *clk;
> +       int ctrl_speed;
> +
> +       int err;
> +       u32 regval;
> +
> +       clk = clk_get(&pdev->dev, NULL);
> +       if (IS_ERR(clk)) {
> +               err = PTR_ERR(clk);
> +               dev_err(&pdev->dev, "Clock get failed\n");
> +               goto err_get_clk;
> +       }
> +
> +       err = clk_prepare(clk);
> +       if (err) {
> +               dev_err(&pdev->dev, "Clock prepare failed\n");
> +               goto  err_clk_prep;
> +       }
> +
> +       err = clk_enable(clk);
> +       if (err) {
> +               dev_err(&pdev->dev, "Clock enable failed\n");
> +               goto  err_clk_en;
> +       }
> +
> +       ctrl_speed = clk_get_rate(clk);
> +
> +       new_adapter = devm_kzalloc(&pdev->dev, sizeof(*new_adapter), GFP_KERNEL);
> +       if (!new_adapter) {
> +               dev_err(&pdev->dev,
> +                       "Can't allocate new i2c adapter!\n");
> +               err = -ENOMEM;
> +               goto out;
> +       }
> +
> +       siic = devm_kzalloc(&pdev->dev, sizeof(*siic), GFP_KERNEL);
> +       if (!siic) {
> +               dev_err(&pdev->dev, "Can't allocate driver data\n");
> +               err = -ENOMEM;
> +               goto out;
> +       }
> +       new_adapter->class = I2C_CLASS_HWMON | I2C_CLASS_DDC | I2C_CLASS_SPD;
> +       siic->adapter = new_adapter;
> +
> +       mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       if (mem_res == NULL) {
> +               dev_err(&pdev->dev, "Unable to get MEM resource\n");
> +               err = -EINVAL;
> +               goto out;
> +       }
> +
> +       siic->base =
> +               devm_ioremap(&pdev->dev, mem_res->start, (mem_res->end - mem_res->start + 1));
> +       if (siic->base == NULL) {
> +               dev_err(&pdev->dev, "IO remap failed!\n");
> +               err = -ENOMEM;
> +               goto out;
> +       }
> +
> +       siic->irq = platform_get_irq(pdev, 0);
> +       if (!siic->irq) {
> +               err = -EINVAL;
> +               goto out;
> +       }
> +       err = devm_request_irq(&pdev->dev, siic->irq, i2c_sirfsoc_irq, 0,
> +               dev_name(&pdev->dev), siic);
> +       if (err)
> +               goto out;
> +
> +       new_adapter->algo = &i2c_sirfsoc_algo;
> +       new_adapter->algo_data = siic;
> +
> +       new_adapter->dev.parent = &pdev->dev;
> +       new_adapter->nr = pdev->id;
> +
> +       strlcpy(new_adapter->name, "sirfsoc-i2c", sizeof(new_adapter->name));
> +
> +       platform_set_drvdata(pdev, new_adapter);
> +       init_completion(&siic->done);
> +
> +       /* Controller Initalisation */
> +
> +       writel(SIRFSOC_I2C_RESET, siic->base + SIRFSOC_I2C_CTRL);
> +       while (readl(siic->base + SIRFSOC_I2C_CTRL) & SIRFSOC_I2C_RESET)
> +               cpu_relax();
> +       writel(SIRFSOC_I2C_CORE_EN | SIRFSOC_I2C_MASTER_MODE,
> +               siic->base + SIRFSOC_I2C_CTRL);
> +
> +       siic->clk = clk;
> +       siic->speed = SIRFSOC_I2C_DEFAULT_SPEED;
> +       if (siic->speed < 100000)
> +               regval =
> +                       (2 * ctrl_speed) / (2 * siic->speed * 11);
> +       else
> +               regval = ctrl_speed / (siic->speed * 5);
> +
> +       writel(regval, siic->base + SIRFSOC_I2C_CLK_CTRL);
> +       if (regval > 0xFF)
> +               writel(0xFF, siic->base + SIRFSOC_I2C_SDA_DELAY);
> +       else
> +               writel(regval, siic->base + SIRFSOC_I2C_SDA_DELAY);
> +
> +       err = i2c_add_numbered_adapter(new_adapter);
> +       if (err < 0) {
> +               dev_err(&pdev->dev, "Can't add new i2c adapter\n");
> +               goto out;
> +       }
> +
> +       clk_disable(clk);
> +
> +       dev_info(&pdev->dev, " I2C adapter ready to operate\n");
> +
> +       return 0;
> +
> +out:
> +       clk_disable(clk);
> +err_clk_en:
> +       clk_unprepare(clk);
> +err_clk_prep:
> +       clk_put(clk);
> +err_get_clk:
> +       return err;
> +}
> +
> +static int __devexit i2c_sirfsoc_remove(struct platform_device *pdev)
> +{
> +       struct i2c_adapter *adapter = platform_get_drvdata(pdev);
> +       struct sirfsoc_i2c *siic = adapter->algo_data;
> +
> +       writel(SIRFSOC_I2C_RESET, siic->base + SIRFSOC_I2C_CTRL);
> +       i2c_del_adapter(adapter);
> +       clk_disable(siic->clk);
> +       clk_unprepare(siic->clk);
> +       clk_put(siic->clk);
> +       return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +static int i2c_sirfsoc_suspend(struct platform_device *pdev, pm_message_t msg)
> +{
> +       struct i2c_adapter *adapter = platform_get_drvdata(pdev);
> +       struct sirfsoc_i2c *siic = adapter->algo_data;
> +
> +       siic->sda_delay = readl(siic->base + SIRFSOC_I2C_SDA_DELAY);
> +       siic->clk_div = readl(siic->base + SIRFSOC_I2C_CLK_CTRL);
> +       return 0;
> +}
> +
> +static int i2c_sirfsoc_resume(struct platform_device *pdev)
> +{
> +       struct i2c_adapter *adapter = platform_get_drvdata(pdev);
> +       struct sirfsoc_i2c *siic = adapter->algo_data;
> +
> +       writel(SIRFSOC_I2C_RESET, siic->base + SIRFSOC_I2C_CTRL);
> +       writel(SIRFSOC_I2C_CORE_EN | SIRFSOC_I2C_MASTER_MODE,
> +               siic->base + SIRFSOC_I2C_CTRL);
> +       writel(siic->clk_div, siic->base + SIRFSOC_I2C_CLK_CTRL);
> +       writel(siic->sda_delay, siic->base + SIRFSOC_I2C_SDA_DELAY);
> +       return 0;
> +}
> +#else
> +#define i2c_sirfsoc_suspend    NULL
> +#define i2c_sirfsoc_resume     NULL
> +#endif
> +
> +static const struct of_device_id sirfsoc_i2c_of_match[] __devinitconst = {
> +       { .compatible = "sirf,prima2-i2c", },
> +       {},
> +};
> +MODULE_DEVICE_TABLE(of, sirfsoc_i2c_of_match);
> +
> +static struct platform_driver i2c_sirfsoc_driver = {
> +       .driver = {
> +               .name = "sirfsoc_i2c",
> +               .owner = THIS_MODULE,
> +               .of_match_table = sirfsoc_i2c_of_match,
> +       },
> +       .probe = i2c_sirfsoc_probe,
> +       .remove = __devexit_p(i2c_sirfsoc_remove),
> +       .suspend = i2c_sirfsoc_suspend,
> +       .resume = i2c_sirfsoc_resume,
> +};
> +
> +static int __init i2c_sirfsoc_init(void)
> +{
> +       return platform_driver_register(&i2c_sirfsoc_driver);
> +}
> +arch_initcall(i2c_sirfsoc_init);
> +
> +static void __exit i2c_sirfsoc_exit(void)
> +{
> +       platform_driver_unregister(&i2c_sirfsoc_driver);
> +}
> +module_exit(i2c_sirfsoc_exit);
> +
> +MODULE_DESCRIPTION("SiRF SoC I2C master controller driver");
> +MODULE_AUTHOR("Zhiwu Song <Zhiwu.Song@csr.com>, "
> +       "Xiangzhen Ye <Xiangzhen.Ye@csr.com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/i2c/busses/i2c-sirf.h b/drivers/i2c/busses/i2c-sirf.h
> new file mode 100644
> index 0000000..28f4ada
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-sirf.h
> @@ -0,0 +1,61 @@
> +/*
> + * I2C bus drivers for CSR SiRFprimaII
> + *
> + * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
> + *
> + * Licensed under GPLv2 or later.
> + */
> +
> +#ifndef _SIRFSOC_I2C_BUS_H_
> +#define _SIRFSOC_I2C_BUS_H_
> +
> +#include <linux/bitops.h>
> +
> +#define SIRFSOC_I2C_CLK_CTRL           0x00
> +#define SIRFSOC_I2C_STATUS             0x0C
> +#define SIRFSOC_I2C_CTRL               0x10
> +#define SIRFSOC_I2C_IO_CTRL            0x14
> +#define SIRFSOC_I2C_SDA_DELAY          0x18
> +#define SIRFSOC_I2C_CMD_START          0x1C
> +#define SIRFSOC_I2C_CMD_BUF            0x30
> +#define SIRFSOC_I2C_DATA_BUF           0x80
> +
> +#define SIRFSOC_I2C_CMD_BUF_MAX                16
> +#define SIRFSOC_I2C_DATA_BUF_MAX       16
> +
> +#define SIRFSOC_I2C_CMD(x)             (SIRFSOC_I2C_CMD_BUF + (x)*0x04)
> +#define SIRFSOC_I2C_DATA_MASK(x)        (0xFF<<(((x)&3)*8))
> +#define SIRFSOC_I2C_DATA_SHIFT(x)       (((x)&3)*8)
> +
> +#define SIRFSOC_I2C_DIV_MASK           (0xFFFF)
> +
> +/* I2C status flags */
> +#define SIRFSOC_I2C_STAT_BUSY          BIT(0)
> +#define SIRFSOC_I2C_STAT_TIP           BIT(1)
> +#define SIRFSOC_I2C_STAT_NACK          BIT(2)
> +#define SIRFSOC_I2C_STAT_TR_INT                BIT(4)
> +#define SIRFSOC_I2C_STAT_STOP          BIT(6)
> +#define SIRFSOC_I2C_STAT_CMD_DONE      BIT(8)
> +#define SIRFSOC_I2C_STAT_ERR           BIT(9)
> +#define SIRFSOC_I2C_CMD_INDEX          (0x1F<<16)
> +
> +/* I2C control flags */
> +#define SIRFSOC_I2C_RESET              BIT(0)
> +#define SIRFSOC_I2C_CORE_EN            BIT(1)
> +#define SIRFSOC_I2C_MASTER_MODE                BIT(2)
> +#define SIRFSOC_I2C_CMD_DONE_EN                BIT(11)
> +#define SIRFSOC_I2C_ERR_INT_EN         BIT(12)
> +
> +#define SIRFSOC_I2C_SDA_DELAY_MASK     (0xFF)
> +#define SIRFSOC_I2C_SCLF_FILTER                (3<<8)
> +
> +#define SIRFSOC_I2C_START_CMD          BIT(0)
> +
> +#define SIRFSOC_I2C_CMD_RP(x)          ((x)&0x7)
> +#define SIRFSOC_I2C_NACK               BIT(3)
> +#define SIRFSOC_I2C_WRITE              BIT(4)
> +#define SIRFSOC_I2C_READ               BIT(5)
> +#define SIRFSOC_I2C_STOP               BIT(6)
> +#define SIRFSOC_I2C_START              BIT(7)
> +
> +#endif
> --
> 1.7.1

Patch

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index b2b8562..f97772c 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -619,6 +619,13 @@  config I2C_SH_MOBILE
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-sh_mobile.
 
+config I2C_SIRF
+	tristate "CSR SiRFprimaII I2C interface"
+	depends on ARCH_PRIMA2
+	help
+	  If you say yes to this option, support will be included for the
+	  CSR SiRFprimaII I2C interface.
+
 config I2C_SIMTEC
 	tristate "Simtec Generic I2C interface"
 	select I2C_ALGOBIT
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index fba6da6..c30db66 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -62,6 +62,7 @@  obj-$(CONFIG_I2C_S3C2410)	+= i2c-s3c2410.o
 obj-$(CONFIG_I2C_S6000)		+= i2c-s6000.o
 obj-$(CONFIG_I2C_SH7760)	+= i2c-sh7760.o
 obj-$(CONFIG_I2C_SH_MOBILE)	+= i2c-sh_mobile.o
+obj-$(CONFIG_I2C_SIRF)		+= i2c-sirf.o
 obj-$(CONFIG_I2C_SIMTEC)	+= i2c-simtec.o
 obj-$(CONFIG_I2C_STU300)	+= i2c-stu300.o
 obj-$(CONFIG_I2C_TEGRA)		+= i2c-tegra.o
diff --git a/drivers/i2c/busses/i2c-sirf.c b/drivers/i2c/busses/i2c-sirf.c
new file mode 100644
index 0000000..1d694f6
--- /dev/null
+++ b/drivers/i2c/busses/i2c-sirf.c
@@ -0,0 +1,432 @@ 
+/*
+ * I2C bus driver for CSR SiRFprimaII
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include "i2c-sirf.h"
+
+#define SIRFSOC_I2C_DEFAULT_SPEED  100000
+
+struct sirfsoc_i2c {
+	void __iomem *base;
+	struct clk *clk;
+	unsigned long speed;	/* I2C SCL frequency */
+	int irq;
+	u32 cmd_ptr;		/* Current position in CMD buffer */
+	u8 *buf;		/* Buffer passed by user */
+	u32 msg_len;		/* Message length */
+	u32 finished_len;	/* number of bytes read/written */
+	u32 read_cmd_len;	/* number of read cmd sent */
+	int msg_read;		/* 1 indicates a read message */
+	int err_status;		/* 1 indicates an error on bus */
+
+	u32 sda_delay;		/* For suspend/resume */
+	u32 clk_div;
+	int last;		/* Last message in transfer, STOP cmd can be sent */
+
+	struct completion done;	/* indicates completion of message transfer */
+	struct i2c_adapter *adapter;
+};
+
+static void i2c_sirfsoc_read_data(struct sirfsoc_i2c *siic)
+{
+	u32 data = 0;
+	int i = 0;
+
+	for (i = 0; i < siic->read_cmd_len; i++) {
+		if (!(i & 0x3))
+			data = readl(siic->base + SIRFSOC_I2C_DATA_BUF + i);
+		siic->buf[siic->finished_len++] =
+			(unsigned char)((data & SIRFSOC_I2C_DATA_MASK(i)) >>
+				SIRFSOC_I2C_DATA_SHIFT(i));
+
+		BUG_ON(siic->finished_len > siic->msg_len);
+	}
+}
+
+static void i2c_sirfsoc_queue_cmd(struct sirfsoc_i2c *siic)
+{
+	u32 regval;
+	int i = 0;
+
+	if (siic->msg_read) {
+		while (((siic->finished_len + i) < siic->msg_len)
+			&& (siic->cmd_ptr < SIRFSOC_I2C_CMD_BUF_MAX)) {
+			regval = SIRFSOC_I2C_READ | SIRFSOC_I2C_CMD_RP(0);
+			if (((siic->finished_len + i) ==
+					(siic->msg_len - 1)) && siic->last)
+				regval |= SIRFSOC_I2C_STOP | SIRFSOC_I2C_NACK;
+			writel(regval,
+				siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
+			i++;
+		}
+
+		siic->read_cmd_len = i;
+	} else {
+		while ((siic->cmd_ptr < SIRFSOC_I2C_CMD_BUF_MAX - 1)
+			&& (siic->finished_len < siic->msg_len)) {
+			regval = SIRFSOC_I2C_WRITE | SIRFSOC_I2C_CMD_RP(0);
+			if ((siic->finished_len == (siic->msg_len - 1))
+				&& siic->last)
+				regval |= SIRFSOC_I2C_STOP;
+			writel(regval,
+				siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
+			writel(siic->buf[siic->finished_len++],
+				siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
+		}
+	}
+	siic->cmd_ptr = 0;
+
+	/* Trigger the transfer */
+	writel(SIRFSOC_I2C_START_CMD, siic->base + SIRFSOC_I2C_CMD_START);
+}
+
+static irqreturn_t i2c_sirfsoc_irq(int irq, void *dev_id)
+{
+	struct sirfsoc_i2c *siic = (struct sirfsoc_i2c *)dev_id;
+	u32 i2c_stat = readl(siic->base + SIRFSOC_I2C_STATUS);
+
+	if (i2c_stat & SIRFSOC_I2C_STAT_ERR) {
+		/* Error conditions */
+		siic->err_status = 1;
+		writel(SIRFSOC_I2C_STAT_ERR, siic->base + SIRFSOC_I2C_STATUS);
+
+		if (i2c_stat & SIRFSOC_I2C_STAT_NACK)
+			dev_err(&siic->adapter->dev, "ACK not received\n");
+		else
+			dev_err(&siic->adapter->dev, "I2C error\n");
+
+		complete(&siic->done);
+	} else if (i2c_stat & SIRFSOC_I2C_STAT_CMD_DONE) {
+		/* CMD buffer execution complete */
+		if (siic->msg_read)
+			i2c_sirfsoc_read_data(siic);
+		if (siic->finished_len == siic->msg_len)
+			complete(&siic->done);
+		else /* Fill a new CMD buffer for left data */
+			i2c_sirfsoc_queue_cmd(siic);
+
+		writel(SIRFSOC_I2C_STAT_CMD_DONE, siic->base + SIRFSOC_I2C_STATUS);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void i2c_sirfsoc_set_address(struct sirfsoc_i2c *siic,
+	struct i2c_msg *msg)
+{
+	unsigned char addr;
+	u32 regval = SIRFSOC_I2C_START | SIRFSOC_I2C_CMD_RP(0) | SIRFSOC_I2C_WRITE;
+
+	/* no data and last message -> add STOP */
+	if (siic->last && (msg->len == 0))
+		regval |= SIRFSOC_I2C_STOP;
+
+	writel(regval, siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
+
+	addr = msg->addr << 1;	/* Generate address */
+	if (msg->flags & I2C_M_RD)
+		addr |= 1;
+	if (msg->flags & I2C_M_REV_DIR_ADDR)	/* Reverse direction bit */
+		addr ^= 1;
+
+	writel(addr, siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
+}
+
+static int i2c_sirfsoc_xfer_msg(struct sirfsoc_i2c *siic, struct i2c_msg *msg)
+{
+	u32 regval = readl(siic->base + SIRFSOC_I2C_CTRL);
+	int timeout = (msg->len + 1) * 50;
+	int ret = 0;
+
+	i2c_sirfsoc_set_address(siic, msg);
+
+	writel(regval | SIRFSOC_I2C_CMD_DONE_EN | SIRFSOC_I2C_ERR_INT_EN,
+		siic->base + SIRFSOC_I2C_CTRL);
+	i2c_sirfsoc_queue_cmd(siic);
+
+	if (wait_for_completion_timeout(&siic->done, timeout) == 0) {
+		siic->err_status = 1;
+		dev_err(&siic->adapter->dev, "Transfer timeout\n");
+	}
+
+	writel(regval & ~(SIRFSOC_I2C_CMD_DONE_EN | SIRFSOC_I2C_ERR_INT_EN),
+		siic->base + SIRFSOC_I2C_CTRL);
+	writel(0, siic->base + SIRFSOC_I2C_CMD_START);
+
+	if (siic->err_status) {
+		writel(readl(siic->base + SIRFSOC_I2C_CTRL) | SIRFSOC_I2C_RESET,
+			siic->base + SIRFSOC_I2C_CTRL);
+		while (readl(siic->base + SIRFSOC_I2C_CTRL) & SIRFSOC_I2C_RESET)
+			cpu_relax();
+
+		ret = -EIO;
+	}
+
+	return ret;
+}
+
+static u32 i2c_sirfsoc_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static int i2c_sirfsoc_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
+	int num)
+{
+	struct sirfsoc_i2c *siic = adap->algo_data;
+	int i, ret;
+
+	for (i = 0; i < num; i++) {
+		siic->buf = msgs[i].buf;
+		siic->msg_len = msgs[i].len;
+
+		if (msgs[i].flags & I2C_M_RD)
+			siic->msg_read = 1;
+		else
+			siic->msg_read = 0;
+
+		siic->err_status = 0;
+		siic->cmd_ptr = 0;
+		siic->finished_len = 0;
+		if (i == (num - 1))
+			siic->last = 1;
+		else
+			siic->last = 0;
+
+		ret = i2c_sirfsoc_xfer_msg(siic, &msgs[i]);
+		if (ret) {
+			clk_disable(siic->clk);
+			return ret;
+		}
+	}
+
+	clk_disable(siic->clk);
+	return num;
+}
+
+/* I2C algorithms associated with this master controller driver */
+static const struct i2c_algorithm i2c_sirfsoc_algo = {
+	.master_xfer = i2c_sirfsoc_xfer,
+	.functionality = i2c_sirfsoc_func,
+};
+
+static int __devinit i2c_sirfsoc_probe(struct platform_device *pdev)
+{
+	struct sirfsoc_i2c *siic;
+	struct i2c_adapter *new_adapter;
+	struct resource *mem_res;
+	struct clk *clk;
+	int ctrl_speed;
+
+	int err;
+	u32 regval;
+
+	clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(clk)) {
+		err = PTR_ERR(clk);
+		dev_err(&pdev->dev, "Clock get failed\n");
+		goto err_get_clk;
+	}
+
+	err = clk_prepare(clk);
+	if (err) {
+		dev_err(&pdev->dev, "Clock prepare failed\n");
+		goto  err_clk_prep;
+	}
+
+	err = clk_enable(clk);
+	if (err) {
+		dev_err(&pdev->dev, "Clock enable failed\n");
+		goto  err_clk_en;
+	}
+
+	ctrl_speed = clk_get_rate(clk);
+
+	new_adapter = devm_kzalloc(&pdev->dev, sizeof(*new_adapter), GFP_KERNEL);
+	if (!new_adapter) {
+		dev_err(&pdev->dev,
+			"Can't allocate new i2c adapter!\n");
+		err = -ENOMEM;
+		goto out;
+	}
+
+	siic = devm_kzalloc(&pdev->dev, sizeof(*siic), GFP_KERNEL);
+	if (!siic) {
+		dev_err(&pdev->dev, "Can't allocate driver data\n");
+		err = -ENOMEM;
+		goto out;
+	}
+	new_adapter->class = I2C_CLASS_HWMON | I2C_CLASS_DDC | I2C_CLASS_SPD;
+	siic->adapter = new_adapter;
+
+	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (mem_res == NULL) {
+		dev_err(&pdev->dev, "Unable to get MEM resource\n");
+		err = -EINVAL;
+		goto out;
+	}
+
+	siic->base =
+		devm_ioremap(&pdev->dev, mem_res->start, (mem_res->end - mem_res->start + 1));
+	if (siic->base == NULL) {
+		dev_err(&pdev->dev, "IO remap failed!\n");
+		err = -ENOMEM;
+		goto out;
+	}
+
+	siic->irq = platform_get_irq(pdev, 0);
+	if (!siic->irq) {
+		err = -EINVAL;
+		goto out;
+	}
+	err = devm_request_irq(&pdev->dev, siic->irq, i2c_sirfsoc_irq, 0,
+		dev_name(&pdev->dev), siic);
+	if (err)
+		goto out;
+
+	new_adapter->algo = &i2c_sirfsoc_algo;
+	new_adapter->algo_data = siic;
+
+	new_adapter->dev.parent = &pdev->dev;
+	new_adapter->nr = pdev->id;
+
+	strlcpy(new_adapter->name, "sirfsoc-i2c", sizeof(new_adapter->name));
+
+	platform_set_drvdata(pdev, new_adapter);
+	init_completion(&siic->done);
+
+	/* Controller Initalisation */
+
+	writel(SIRFSOC_I2C_RESET, siic->base + SIRFSOC_I2C_CTRL);
+	while (readl(siic->base + SIRFSOC_I2C_CTRL) & SIRFSOC_I2C_RESET)
+		cpu_relax();
+	writel(SIRFSOC_I2C_CORE_EN | SIRFSOC_I2C_MASTER_MODE,
+		siic->base + SIRFSOC_I2C_CTRL);
+
+	siic->clk = clk;
+	siic->speed = SIRFSOC_I2C_DEFAULT_SPEED;
+	if (siic->speed < 100000)
+		regval =
+			(2 * ctrl_speed) / (2 * siic->speed * 11);
+	else
+		regval = ctrl_speed / (siic->speed * 5);
+
+	writel(regval, siic->base + SIRFSOC_I2C_CLK_CTRL);
+	if (regval > 0xFF)
+		writel(0xFF, siic->base + SIRFSOC_I2C_SDA_DELAY);
+	else
+		writel(regval, siic->base + SIRFSOC_I2C_SDA_DELAY);
+
+	err = i2c_add_numbered_adapter(new_adapter);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Can't add new i2c adapter\n");
+		goto out;
+	}
+
+	clk_disable(clk);
+
+	dev_info(&pdev->dev, " I2C adapter ready to operate\n");
+
+	return 0;
+
+out:
+	clk_disable(clk);
+err_clk_en:
+	clk_unprepare(clk);
+err_clk_prep:
+	clk_put(clk);
+err_get_clk:
+	return err;
+}
+
+static int __devexit i2c_sirfsoc_remove(struct platform_device *pdev)
+{
+	struct i2c_adapter *adapter = platform_get_drvdata(pdev);
+	struct sirfsoc_i2c *siic = adapter->algo_data;
+
+	writel(SIRFSOC_I2C_RESET, siic->base + SIRFSOC_I2C_CTRL);
+	i2c_del_adapter(adapter);
+	clk_disable(siic->clk);
+	clk_unprepare(siic->clk);
+	clk_put(siic->clk);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int i2c_sirfsoc_suspend(struct platform_device *pdev, pm_message_t msg)
+{
+	struct i2c_adapter *adapter = platform_get_drvdata(pdev);
+	struct sirfsoc_i2c *siic = adapter->algo_data;
+
+	siic->sda_delay = readl(siic->base + SIRFSOC_I2C_SDA_DELAY);
+	siic->clk_div = readl(siic->base + SIRFSOC_I2C_CLK_CTRL);
+	return 0;
+}
+
+static int i2c_sirfsoc_resume(struct platform_device *pdev)
+{
+	struct i2c_adapter *adapter = platform_get_drvdata(pdev);
+	struct sirfsoc_i2c *siic = adapter->algo_data;
+
+	writel(SIRFSOC_I2C_RESET, siic->base + SIRFSOC_I2C_CTRL);
+	writel(SIRFSOC_I2C_CORE_EN | SIRFSOC_I2C_MASTER_MODE,
+		siic->base + SIRFSOC_I2C_CTRL);
+	writel(siic->clk_div, siic->base + SIRFSOC_I2C_CLK_CTRL);
+	writel(siic->sda_delay, siic->base + SIRFSOC_I2C_SDA_DELAY);
+	return 0;
+}
+#else
+#define i2c_sirfsoc_suspend	NULL
+#define i2c_sirfsoc_resume	NULL
+#endif
+
+static const struct of_device_id sirfsoc_i2c_of_match[] __devinitconst = {
+	{ .compatible = "sirf,prima2-i2c", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, sirfsoc_i2c_of_match);
+
+static struct platform_driver i2c_sirfsoc_driver = {
+	.driver = {
+		.name = "sirfsoc_i2c",
+		.owner = THIS_MODULE,
+		.of_match_table = sirfsoc_i2c_of_match,
+	},
+	.probe = i2c_sirfsoc_probe,
+	.remove = __devexit_p(i2c_sirfsoc_remove),
+	.suspend = i2c_sirfsoc_suspend,
+	.resume = i2c_sirfsoc_resume,
+};
+
+static int __init i2c_sirfsoc_init(void)
+{
+	return platform_driver_register(&i2c_sirfsoc_driver);
+}
+arch_initcall(i2c_sirfsoc_init);
+
+static void __exit i2c_sirfsoc_exit(void)
+{
+	platform_driver_unregister(&i2c_sirfsoc_driver);
+}
+module_exit(i2c_sirfsoc_exit);
+
+MODULE_DESCRIPTION("SiRF SoC I2C master controller driver");
+MODULE_AUTHOR("Zhiwu Song <Zhiwu.Song@csr.com>, "
+	"Xiangzhen Ye <Xiangzhen.Ye@csr.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/i2c/busses/i2c-sirf.h b/drivers/i2c/busses/i2c-sirf.h
new file mode 100644
index 0000000..28f4ada
--- /dev/null
+++ b/drivers/i2c/busses/i2c-sirf.h
@@ -0,0 +1,61 @@ 
+/*
+ * I2C bus drivers for CSR SiRFprimaII
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#ifndef _SIRFSOC_I2C_BUS_H_
+#define _SIRFSOC_I2C_BUS_H_
+
+#include <linux/bitops.h>
+
+#define SIRFSOC_I2C_CLK_CTRL		0x00
+#define SIRFSOC_I2C_STATUS		0x0C
+#define SIRFSOC_I2C_CTRL		0x10
+#define SIRFSOC_I2C_IO_CTRL		0x14
+#define SIRFSOC_I2C_SDA_DELAY		0x18
+#define SIRFSOC_I2C_CMD_START		0x1C
+#define SIRFSOC_I2C_CMD_BUF		0x30
+#define SIRFSOC_I2C_DATA_BUF		0x80
+
+#define SIRFSOC_I2C_CMD_BUF_MAX		16
+#define SIRFSOC_I2C_DATA_BUF_MAX	16
+
+#define SIRFSOC_I2C_CMD(x)		(SIRFSOC_I2C_CMD_BUF + (x)*0x04)
+#define SIRFSOC_I2C_DATA_MASK(x)        (0xFF<<(((x)&3)*8))
+#define SIRFSOC_I2C_DATA_SHIFT(x)       (((x)&3)*8)
+
+#define SIRFSOC_I2C_DIV_MASK		(0xFFFF)
+
+/* I2C status flags */
+#define SIRFSOC_I2C_STAT_BUSY		BIT(0)
+#define SIRFSOC_I2C_STAT_TIP		BIT(1)
+#define SIRFSOC_I2C_STAT_NACK		BIT(2)
+#define SIRFSOC_I2C_STAT_TR_INT		BIT(4)
+#define SIRFSOC_I2C_STAT_STOP		BIT(6)
+#define SIRFSOC_I2C_STAT_CMD_DONE	BIT(8)
+#define SIRFSOC_I2C_STAT_ERR		BIT(9)
+#define SIRFSOC_I2C_CMD_INDEX		(0x1F<<16)
+
+/* I2C control flags */
+#define SIRFSOC_I2C_RESET		BIT(0)
+#define SIRFSOC_I2C_CORE_EN		BIT(1)
+#define SIRFSOC_I2C_MASTER_MODE		BIT(2)
+#define SIRFSOC_I2C_CMD_DONE_EN		BIT(11)
+#define SIRFSOC_I2C_ERR_INT_EN		BIT(12)
+
+#define SIRFSOC_I2C_SDA_DELAY_MASK	(0xFF)
+#define SIRFSOC_I2C_SCLF_FILTER		(3<<8)
+
+#define SIRFSOC_I2C_START_CMD		BIT(0)
+
+#define SIRFSOC_I2C_CMD_RP(x)		((x)&0x7)
+#define SIRFSOC_I2C_NACK		BIT(3)
+#define SIRFSOC_I2C_WRITE		BIT(4)
+#define SIRFSOC_I2C_READ		BIT(5)
+#define SIRFSOC_I2C_STOP		BIT(6)
+#define SIRFSOC_I2C_START		BIT(7)
+
+#endif